Emco V10 drive pully end float

lakeside53 · Post by **lakeside53** » Sun Nov 11, 2007 11:36 pm

I've been hearing a knocking noise from around the motor belt area. Turns out my emco driven pully (headstock end) is quite sloppy on the shaft (I'm going to bore and sleeve it). I pulled it off, was looking closley at the shaft and noticed it had a lot of end float - about 1/2mm (20 thou).

Can someone please tug on their shaft and see if it's the same?

niedz · Post by **niedz** » Mon Dec 28, 2009 11:00 pm

hi lakeside,
my machine has this same problem, just discovered it so i came searching for answers. i had some knocking, and saw that the drive belt had walked off the pulley a little.

i have about 1mm of play on that pulley also. i pulled it apart to see that the layshaft and journal bearings have some wear on them most likely contributing to the play. the layshaft bearing (on the pulley side) and the pulley and the bearing cover also have some wear.

im thinking about making a new journal bearing (opposite end of the shaft) that is a little longer than the original to take up the slack, but i still need to re-evaluate that. the layshaft bearing is pressed pretty well into the bearing cover, and very soft so im a little scared to knock it out and make a new one of those. or i was thinking maybe shim it with a bronze washer, but i wouldnt know how to get or make one thin enough to work.

any ideas?

niedz · Post by **niedz** » Tue Dec 29, 2009 9:45 am

i re-examined the play in the pulley.
although there is a good amount of lateral movement in the shaft i dont think that is a problem. the pulley fits pretty loose on the shaft end. i think i am going to try and make a thin split sleeve that fits over the shaft to take up the slop in the pulley.
good thing i can run the lathe to make the part!

steamin10 · Post by **steamin10** » Tue Dec 29, 2009 11:26 am

Pulleys are notorious for getting an hourglass bore from the belt tension rolling the metal out of the bore.

One answer is a new pulley of course. Thats no fun, so boring the pulley to an oversize, and fitting a sleeve with the key in it is much more fun. Putting in a larger set screw is helpfull to, as is using industrial thread locker when its all lined up.

I am surprised at over the years how many well used machines suffer from these wear conditions alone, and how well this works. In multiperson shops, these details are ignored because they dont make money, and fall from importance.

Jose Rivera · Post by **Jose Rivera** » Tue Dec 29, 2009 1:41 pm

What model Emco you have ?

niedz · Post by **niedz** » Wed Dec 30, 2009 7:01 pm

i have a V10P.

niedz · Post by **niedz** » Wed Dec 30, 2009 7:03 pm

steamin10 wrote:
One answer is a new pulley of course. Thats no fun, so boring the pulley to an oversize, and fitting a sleeve with the key in it is much more fun. Putting in a larger set screw is helpfull to, as is using industrial thread locker when its all lined up.

i would love to take this route, but id need to buy a second lathe to do that!

Jose Rivera · Post by **Jose Rivera** » Wed Dec 30, 2009 9:25 pm

I have the V10 P Mentor and never had trouble with the belt.

What I had several times is small chips that fall into the gears and cause a clacking noise.

I had at times to carefully scrape each gullet on the gears with a sharp scriber.
They're hard to find some times because they can be pushed down tight and they may look just like nothing is there.

Turn the chuck by hand at low speed. If you still get a noise then there is something in the gears.

niedz · Post by **niedz** » Wed Dec 30, 2009 10:25 pm

the pulley is definitely a problem id like to correct at some point, but the knocking may be related to a chip on a gear. i did inspect the gears, but ill take a look.